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Evidence for late formation and young metamorphism in the Achondrite Nakhla

Papanastassiou, D. A. and Wasserburg, G. J. (1974) Evidence for late formation and young metamorphism in the Achondrite Nakhla. Geophysical Research Letters, 1 (1). pp. 23-26. ISSN 0094-8276. https://resolver.caltech.edu/CaltechAUTHORS:20141111-143331808

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Abstract

We have determined an age T=1.37 AE for Nakhla and an initial ^(87)Sr/^(86)Sr, I = 0.7023. A rather thorough Sr equilibration took place at this time between all the phases of this meteorite, but there is clear evidence of somewhat incomplete isotopic equilibrium during the 1.37 AE event, which is not consistent with the derivation of Nakhla from a magma at this time. Nakhla has a young model age of 3.6-2.9 AE which requires that gross differentiation processes for its parent body occur between 3.6 and 1.37 AE, significantly later than 4.6 AE. The most reasonable model is that Nakhla formed as an igneous rock at ∼3 AE and was metamorphosed at 1.37 AE. Several similarities exist between the Nakhla parent planet and the Earth and indicate the existence of other objects with close terrestrial chemical affinities.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/GL001i001p00023DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/GL001i001p00023/abstractPublisherArticle
ORCID:
AuthorORCID
Wasserburg, G. J.0000-0002-7957-8029
Additional Information:Copyright © 1974 by the American Geophysical Union. (Received April 15, 1974; accepted April 24, 1974.) The sample from the Harvard collection was provided through the generous courtesy of Professor C. Frondel with prompting from Judith Frondel. We thank R. A. Schmitt for stimulating our interest in Nakhla in a Mexican restaurant and for providing us with a sample. A. L. Albee provided incisive comments at a critical stage of this paper. This work was supported by the National Science Foundation, Grant GP 28027.
Funders:
Funding AgencyGrant Number
NSFGP 28027
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Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences2476
Issue or Number:1
Record Number:CaltechAUTHORS:20141111-143331808
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20141111-143331808
Official Citation:(1974), Evidence for late formation and young metamorphism in the Achondrite Nakhla. Geophysical Research Letters, 1: 23–26. doi: 10.1029/GL001i001p00023
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51599
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:11 Nov 2014 23:04
Last Modified:09 Mar 2020 13:19

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